界面摩擦影响弹体冲击平纹织物过程的数值模拟

Numerical modeling of friction influence during ballistic impact of plain-weave fabric

利用Ansys/ls-dyna模拟球形弹体分别冲击100 mm×100 mm单、双层织物的过程,通过对μ=0、0.3、0.5界面摩擦情况下弹体剩余速度的对比,从能量转移的角度对界面摩擦在冲击过程中所起的作用进行分析。模拟结果表明:不论单层织物还是双层织物,界面摩擦都会影响织物吸收冲击能量的能力;界面摩擦除使冲击过程中产生摩擦滑移能之外,更主要地是增加织物以纱线的动能与形变能的形式吸收的能量,从而提高织物吸收能量的能力;层数在织物对冲击能量的吸收上也有影响,层数增加一倍,织物的吸收能力也会增加将近一倍。

The Ansys/ls-dyna was used to model the ballistic process of single-layer and two-layer plain-weave fabric impacted by spherical projectile. By comparing projectile velocity in three different friction conditions of μ=0,0.3,0.5,the effect of friction during the impact was analyzed from the point of energy transfer. Modeling results show that friction has an impact on the capacity of absorbing energy of single-layer and two-layer fabric. The friction increasing the absorbing energy capacity is not only due to the production of frictional energy,but also due to the increase of kinetic energy and internal energy of the yarn.Moreover,the numbers of layers also have an impact on the energy absorbing. If the layers double,the capacity of absorbing energy of fabric is almost doubled.